body,html,ul,li,div,p{
  border: 0;
  padding: 0;
  margin: 0;
}
li{
  list-style: none;
}
a{
  text-decoration: none;
}
.nav{
  overflow: hidden;
  background:#000;
}
.nav > li{
  padding:15px 20px;
  float: left;
  color: #fff;
  font-size: 20px;
}
.nav > li > a{
  color: #fff;
  font-size: 16px;
}
.left-nav> li > .on,.nav > li > .on{
  color: red;
}
.index{
  padding: 20px;
}
.left-nav{
  float: left;
  width: 100px;
  min-height: 700px;
  line-height:40px;
  background:#000
}
.left-nav li{
  padding: 0 10px;
}
.left-nav li:hover{
  background:#909090;
}
.left-nav a{
  color: #fff;
  display: block;
}
.right-index{
  float: left;
  border: 1px solid #000;
  width: 900px;
  margin-left: 20px;
  min-height: 700px;
  padding: 20px;
}
.activity-list{
  padding: 20px 0;
}
.activity-list li{
  line-height:30px;
  border-bottom:1px solid #eee;
}
.activity-add form{
  padding: 20px 0;
}